Never really found anything like this but is there any protagonist which trains his speed? like he is known for his speed.
Nothing much said about mc speed but he is faster than even people one big realm than him. Martial World Monster Paradise Everyone Else is a Returnee
if counting movement cultivation techniques i can name a few, but if mainly speed as offense? all i can think of is the flash
I don't think EER fit, he sure is fast but his ability is more like stealth and insane blacksmithing though. still idk anything else, speedster protag are scarce
Speedster - exclusive category, fanfiction term, the flash If you do not want fanfiction, then seek out the assassins and thieves